Fig. 1. Schematic diagram of multispectral system structure

Fig. 2. Curves of optical performance simulation results

Fig. 3. Effect of cavity radius on nonuniformity and optical efficiency

Fig. 4. Schematic diagram of LED layout

Fig. 5. Effect of output slot size on nonuniformity and optical efficiency

Fig. 6. Measured contour distribution of irradiance uniformity under different wavebands

Fig. 7. Diagram of wide spectrum test

Fig. 8. Venous gray scale images of three samples under different wavebands

Fig. 9. Diagram of endoscope compatibility test